Fiber breakage is one of the most negative factors that affect the mechanical performance of unidirectional carbon-fiber (CF)-reinforced composites. In the present study, unidirectional CF-reinforced epoxy (CF/epoxy) laminates with and without fiber breakages located in different layers were manufactured from prepreg via hot compression. The static and cyclic flexural mechanical properties of the unidirectional CF/epoxy laminates were determined through static and low-cycle three-point bending tests. Flexural behavior was observed by using optical microscopy to discuss the failure behavior of the unidirectional CF/epoxy laminates. Results indicated that fiber breakages in different layers led to the static and cyclic mechanical degradation of the unidirectional CF/epoxy laminates. Moreover, fiber breakages in the tension side displayed higher flexural strength and better cyclic performance than those in the compression side.

中文翻译：

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纤维断裂位置对单向碳纤维/环氧树脂复合材料力学性能的影响

纤维断裂是影响单向碳纤维（CF）增强复合材料机械性能的最不利因素之一。在本研究中，由预浸料经热压制得了具有和不具有纤维断裂的单向CF增强环氧树脂（CF /环氧）层压板，它们位于不同的层中。通过静态和低循环三点弯曲测试确定了单向CF /环氧树脂层压板的静态和循环弯曲机械性能。通过使用光学显微镜观察弯曲行为，以讨论单向CF /环氧树脂层压板的破坏行为。结果表明，不同层中的纤维断裂导致单向CF /环氧树脂层压板的静态和循环机械降解。而且，